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Deferred Income and Revenue Participation Rights - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2011 USD ($) | Dec. 31, 2017 USD ($) Project Investment $ / Security shares
Deferred Revenue Arrangement [Line Items] |  |
Revenue participation agreement |  | $ 15,000,000
"Seattle" Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Percentage of revenue owed to certificate holder per each million invested |  | 1.00%
Common shares issued per unit | shares |  | 100,000
Galt Resources, LLC [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Percentage of revenue owed to certificate holders |  | 50.00%
Percentage of revenue owed to certificate holder per each million invested |  | 1.00%
Investment multiplier in case of project success | Investment |  | 3
Projects after bifurcation | Project |  | 2
Galt Resources, LLC [Member] | SS Gairsoppa [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Deferred revenue |  | $ 3,756,250
Galt Resources, LLC [Member] | Maximum [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Investment for future revenue rights | $ 7,512,500 |
HMS Victory Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Percentage of revenue owed to certificate holders |  | 7.5125%
Revenue Participation Certificates [Member] | "Cambridge" Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue participation certificates per unit value | $ / Security |  | 50,000
Revenue Participation Certificates [Member] | "Seattle" Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue participation certificates per unit value | $ / Security |  | 50,000
First Payment [Member] | "Cambridge" Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Percentage of revenue owed to certificate holders |  | 100.00%
Revenue owed to certificate holder |  | $ 825,000
Second Payment [Member] | "Cambridge" Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Percentage of revenue owed to certificate holders |  | 24.75%
Second Payment [Member] | "Cambridge" Project [Member] | Minimum [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue owed to certificate holder |  | $ 4,000,000
Second Payment [Member] | "Cambridge" Project [Member] | Maximum [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Revenue owed to certificate holder |  | $ 35,000,000
Third Payment [Member] | "Cambridge" Project [Member] |  |
Deferred Revenue Arrangement [Line Items] |  |
Percentage of revenue owed to certificate holders |  | 12.375%
Revenue owed to certificate holder |  | $ 35,000,000

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